The reason for the block appears to be a ministerial decision, on recommendation of the Bank of Italy; Zopa has removed from the list of financial intermediaries because of stock Account Zopa lenders of money waiting to exit the loan.

Now with a communiqué on the blog administrator Sella said:

Dear Zopiani,
I always let the excellent cooperation they were my relations with our attentive and active community that has participated since the first day with passion and spirit of cooperation to the growth of Zopa.
But I must speak directly at a very critical and the Zopa social lending in Italy.

We have indeed received the decree of the Ministry of Economy and Finance who, on the recommendation of the Bank of italy, has effected the cancellation of Zopa dawn of financial ex Article 106. The company is evaluating all steps, including judicial nature, to protect its position and the community.
We are therefore forced to suspend discussion of new loans and the entry of new suppliers, and we want to continue, in a rigorous and precise as ever, to administer the loans outstanding.
But here I want to clarify what was the path that Zopa has done before being allowed to operate.
Initial reports with the Bank of italy date back to the late spring of 2006 when we appointed lawyers have begun to introduce the draft of Zopa to the Bank of Italy, to arrive, after a meeting and exchanged several letters, all authorization received in September 2007 by the Italian Exchange with the Registration of Financial ex Article 106. Zopa has also started operating in January 2008.
A mission from the Bank of Italy in recent months, there have been moves of the disputes to which we replied – while maintaining the soundness of our legal setting initiative – offering solutions with institutional counterparties that have in fact made no the complaint which we had been moved. But this was evidently not enough.
Zopa is an innovative project to very high ethical content and solidarity. Just consider that in 2008 (year of crisis in the century of creative accounting and fraud by billionaire) Providers zopiani have received excellent returns and applicants rates very favorable. In this moment of crisis, many plead the need for micro-credit loans united in favor of the less privileged classes: Zopa that he was doing.
It should be emphasized that to date the shareholder members have funded the company with more than 5 million, with the aim of making a serious business and reliable for all parties involved. People who are part of the team have been carefully chosen and best represent the spirit that animated us from day one: professionalism, but also the enthusiasm typical of people conscious of participating in a project ethical and social – as evidenced by the stories zopiane collected in the blog – but also very convenient for those who make part of this innovative ‘community of credit’.
Zopa in have always been transparent, not for fashion or convenience but for DNA. We believe in an ambitious project and we have developed in our country. It will handle this stage, hopefully soon, with our usual style, trying to minimize the inconvenience to all members of the community.
Thank you in advance for all the support that we want to give.
Maurizio Sella
Managing Zopa Italy SpA

Here instead the services remain active and not:
Remain active the following services:

Providers
credited monthly installments of loans outstanding
control movement and balance Zopa Wallet
Monitoring of loans financed
withdraw funds
update your personal information.

Applicants
charge rates up to repaying the loans
early repayment of the loan
view details of loans outstanding
rate control has been repayment rate
update your personal information.
Become inactive the following services:

Providers
creation and editing offer (all offers have been disabled in progress)
Re-Auto Loans
additional funds
RientroRapido
Fund assistance Delays

Applicants
new loan request